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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7415c5959ac31b40548e09fe6a5fa40936e5ca1eeb00162d5be46decbf56f0cf' 
  AND token = 'HS0F7YTL5b0SbSTMOSffVLU3o+QjkoES6IpJofomw4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}